Arabian Journal for Science and Engineering

, Volume 38, Issue 2, pp 251–261 | Cite as

Using Exergy to Assess Regional and National Energy Utilization: A Comparative Review

Research Article - Special Issue - Mechanical Engineering

Abstract

The use of exergy to assess energy-utilization efficiencies for energy systems is described. Furthermore, energy and exergy losses are compared, demonstrating that the latter represent the actual deviation of efficiency from the ideal. The methodology is outlined and illustrated with several case studies, including the province of Ontario, Canada and the USA. The approach utilizes data on the energy utilization in a country or region, including flows of energy and exergy through the main sectors of the economy. The results are expected to be of use to government and public authorities that administer regional and national energy systems and carry out planning, and should help improve the effectiveness of such endeavours.

Keywords

Energy Exergy National energy use Efficiency 

List of Symbols

H

Heating value (kJ/kg)

ke

Specific kinetic energy (kJ/kg)

m

Mass (kg)

P

Pressure (atm)

Q

Heat (kJ)

T

Temperature (K or °C)

W

Work (kJ)

We

Electrical energy (kJ/)

η

Energy efficiency (%)

ψ

Exergy efficiency (%)

Subscripts

e

Electrical

f

Fuel

o

Reference-environment state

p

Product

s

Stream of matter

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Copyright information

© King Fahd University of Petroleum and Minerals 2012

Authors and Affiliations

  1. 1.Faculty of Engineering and Applied ScienceUniversity of Ontario Institute of TechnologyOshawaCanada

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